Optional ReadonlygapWidth?: numberThe space between groups of bars, as a percentage of a bar's width, from 0 to 500. Default is Office's: 219 for column charts, 182 for bar charts, and 150 when the series are stacked
Optional Readonlyoverlap?: numberHow much the bars in a group overlap, as a percentage of a bar's width, from -100 (a bar's width apart) to 100. Default is Office's: -27 for column charts and 0 for bar charts. Stacked bars always overlap fully
Options of the charts with bars: column (vertical bars) and bar (horizontal bars) charts.